What is the test for rejecting the evidence of one witness as flawed?

British Columbia, Canada

The following excerpt is from Bergen v. Guliker, 2014 BCSC 5 (CanLII):

In Ng v. Ng, 2011 BCSC 192, Cullen J., as he was then, rejected the evidence of one witness as flawed because “it relies on the mechanism of coincidence, it includes improbable and elaborate explanations to explain away telling circumstances and, in connection with [certain evidence] it relies on a manufactured foundation” (para. 326).

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